I lived in New Florissant for a couple of years and the area I lived in was ok. I prefer St. Charles because of the schools but you may not have children to consider that option. When I lived out there I checked out a couple of the schools and I wasn't pleased in the overall academics level of the students so I registered my son at my parents address in St. Charles and ended up moving out there in 2005.
Are you moving to St. Louis from Arizona? Have you ever lived in Missouri. You may want to look into the St. Peters/St. Charles area if you have children that will be going to school because I know for a fact there are several homes for sale in your price range. Several of these homes are close to the Page Extension which is a straight shot to 70/270/I-70 or where ever you need to go for work. If you have any questions you can email me on my personal email. email@example.com.